# Test generated by:
# ../../../glsl-1.10/variable-index-read.sh 1.00

[require]
GLSL ES >= 1.00
GL ES >= 2.0

[vertex shader]
attribute vec4 vertex;
mat4 projection = mat4(
    2.0/250.0, 0.0, 0.0, -1.0,
    0.0, 2.0/250.0, 0.0, -1.0,
    0.0, 0.0, -1.0, 0.0,
    0.0, 0.0, 0.0, 1.0);
uniform int col;
uniform int row;
uniform float expect;
varying mat3 m;
varying vec4 color;

void main()
{
    gl_Position = vertex;
    gl_Position *= projection;

    m = mat3(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0, 9.0);

    /* From page 23 (page 30 of the PDF) of the GLSL 1.10 spec:
     *
     *     "A vertex shader may also read varying variables, getting back the
     *     same values it has written. Reading a varying variable in a vertex
     *     shader returns undefined values if it is read before being
     *     written."
     */
    color = (m[col][row] == expect)
        ? vec4(0.0, 1.0, 0.0, 1.0) : vec4(1.0, 0.0, 0.0, 1.0);
}

[fragment shader]
precision highp float;
precision highp int;
uniform int col;
uniform int row;
uniform float expect;
varying mat3 m;
varying vec4 color;

void main()
{
    /* There is some trickery here.  The fragment shader has to actually use
     * the varyings generated by the vertex shader, or the compiler (more
     * likely the linker) might demote the varying outputs to just be vertex
     * shader global variables.  Since the point of the test is the vertex
     * shader reading from a varying, that would defeat the test.
     */
    gl_FragColor = (m[col][row] == expect)
        ? color : vec4(1.0, 0.0, 0.0, 1.0);
}

[test]
clear color 0.5 0.5 0.5 0.5
clear

uniform int col 0
uniform int row 0
uniform float expect 1
draw rect 5 5 10 10
probe rgb 10 10 0.0 1.0 0.0

uniform int row 1
uniform float expect 2
draw rect 5 20 10 10
probe rgb 10 25 0.0 1.0 0.0

uniform int row 2
uniform float expect 3
draw rect 5 35 10 10
probe rgb 10 40 0.0 1.0 0.0

uniform int col 1
uniform int row 0
uniform float expect 4
draw rect 20 5 10 10
probe rgb 25 10 0.0 1.0 0.0

uniform int row 1
uniform float expect 5
draw rect 20 20 10 10
probe rgb 25 25 0.0 1.0 0.0

uniform int row 2
uniform float expect 6
draw rect 20 35 10 10
probe rgb 25 40 0.0 1.0 0.0

uniform int col 2
uniform int row 0
uniform float expect 7
draw rect 35 5 10 10
probe rgb 40 10 0.0 1.0 0.0

uniform int row 1
uniform float expect 8
draw rect 35 20 10 10
probe rgb 40 25 0.0 1.0 0.0

uniform int row 2
uniform float expect 9
draw rect 35 35 10 10
probe rgb 40 40 0.0 1.0 0.0